Recursion protect errCB too

Without this
http://localhost:8000/arwiki/%D9%85%D8%B3%D8%AA%D8%AE%D8%AF%D9%85%3A%D8%AE%D8%A7%D9%84%D8%AF%2F%D8%AA%D8%B5%D9%85%D9%8A%D9%85_%D8%A7%D9%84%D8%B5%D9%81%D8%AD%D8%A9_%D8%A7%D9%84%D8%B1%D8%A6%D9%8A%D8%B3%D9%8A%D8%A9?oldid=9455774
will produce a large error reporting recursion.

Change-Id: I575c2958ffe00f52995695057916c7596b9cd34a